CN108318524B - Special temperature measuring rod for field thermophysical property measuring instrument calibration device of buried pipe heat exchanger - Google Patents
Special temperature measuring rod for field thermophysical property measuring instrument calibration device of buried pipe heat exchanger Download PDFInfo
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- CN108318524B CN108318524B CN201810201293.8A CN201810201293A CN108318524B CN 108318524 B CN108318524 B CN 108318524B CN 201810201293 A CN201810201293 A CN 201810201293A CN 108318524 B CN108318524 B CN 108318524B
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- 238000004164 analytical calibration Methods 0.000 title claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 82
- 244000035744 Hura crepitans Species 0.000 claims description 67
- 239000004568 cement Substances 0.000 claims description 49
- 239000004576 sand Substances 0.000 claims description 20
- 238000005507 spraying Methods 0.000 claims description 11
- 238000005553 drilling Methods 0.000 claims description 7
- 239000000565 sealant Substances 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 5
- 238000009529 body temperature measurement Methods 0.000 abstract description 8
- 238000012360 testing method Methods 0.000 description 24
- 238000012795 verification Methods 0.000 description 18
- 239000002689 soil Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 4
- 238000013178 mathematical model Methods 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 238000011065 in-situ storage Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000001502 supplementing effect Effects 0.000 description 3
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000008236 heating water Substances 0.000 description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004831 Hot glue Substances 0.000 description 1
- 241000935974 Paralichthys dentatus Species 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000013499 data model Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- General Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
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- Nonlinear Science (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention discloses a special temperature measuring rod for a field thermophysical property measuring instrument checking device of a buried pipe heat exchanger, which relates to the technical field of ground source heat pumps and comprises a cylindrical body, wherein a plurality of mounting holes are formed in the side face of the body, temperature measuring elements are arranged on the mounting holes, the temperature measuring elements are arranged Kong Tanchu from the mounting, and the distance between the mounting holes is increased from one end of the body in sequence. The invention is a temperature measuring rod which is specially manufactured for the on-site thermophysical property measuring instrument checking device of the ground heat exchanger, and the temperature measuring rod is convenient to assemble and easy to install in the checking device; the temperature measurement precision is high and is less than 0.1 ℃; the temperature measurement resolution is high and is 0.01 ℃; accurate positioning, the temperature measuring range of the checking device is between 0 and 100 ℃, and the measured data can be remotely transmitted to an upper computer.
Description
Technical Field
The invention relates to the technical field of ground source heat pumps, in particular to a temperature measuring rod special for a field thermophysical property measuring instrument checking device of a buried pipe heat exchanger.
Background
The ground source heat pump is taken as a green, energy-saving and environment-friendly system technology, and is increasingly valued and popularized in recent years. The underground rock-soil thermal property parameters are important parameters required in the design of the geothermal heat exchanger of the ground source heat pump, and the size of the rock-soil thermal property parameters has obvious influence on the number of drilling holes and the depth of the drilling holes, so that the initial investment of the ground source heat pump system is influenced.
Due to uncertainty and unknowing of the thermal properties of the rock and soil, designers can only take lower values within a certain range of soil or rock thermal conductivity, resulting in an oversized design system. Therefore, to perform the on-site thermal response test of the ground heat pump buried pipe heat exchanger, the national standard "technical specification of ground source heat pump system engineering (2009 edition) of GB 50366-2005" specifies the on-site thermal response test. The most important link of the on-site thermal response test is to deduce and calculate the thermal physical parameters such as the heat conductivity coefficient, the heat capacity and the like of the underground rock-soil body according to the measured parameters such as the temperature, the flow rate and the heat exchange quantity of the fluid at the inlet and outlet of the buried pipe, so as to know and master the difference of the underground rock-soil body and the influence on the ground source heat pump system, and the ground source heat pump system can be truly designed reasonably and has reliable operation and high economical efficiency. The instrument performing the in-situ thermal response test is referred to as an in-situ thermophysical property meter.
For example, china patent application number 201710598336.6、201610932521.X、201420868088.4、201220678739.4、201210441003.X、201210207869.4、201220140459.8、201110223663.6、201010556776.3、201010542651.5、201110028685.7、201310010514.0、201410635924.9、201120152222.7 discloses an apparatus and method for testing the thermal properties of rock and soil.
However, there is no verification device for an in-situ thermophysical property testing device.
In this regard, the inventors developed a calibration device and method for a field thermophysical property tester for calibrating a field thermophysical property tester of a buried pipe heat exchanger, and filed a patent, but the calibration device is still in a checking stage, and the calibration device can calibrate the temperature, flow, heat, electric power and the like of the existing field thermophysical property tester. The verification device comprises a sandbox, a U-shaped PE pipe, a heating water tank and a circulating water pump; the device needs to measure the temperature field distribution of the outer walls of the sand and the U-shaped PE pipe in the drilling hole and the sandbox so as to calibrate the existing on-site thermophysical property measuring instrument. The sand in the drilling surface and the sandbox needs to be distributed in a temperature field with multiple points, and needs higher positioning accuracy, higher temperature precision and temperature resolution, positioning inaccuracy has larger influence on calculation of thermophysical parameters, insufficient temperature measurement precision influences calibration of measurement parameters of a site thermophysical measuring instrument, and small temperature change is caused by insufficient temperature measurement resolution.
Therefore, the development of a special temperature measuring device for the checking device of the on-site thermophysical property measuring instrument of the buried pipe heat exchanger, which has accurate positioning of the installation position, high temperature measuring precision and high temperature measuring resolution, is urgently needed at present.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the special temperature measuring rod for the checking device of the on-site thermophysical property measuring instrument of the buried pipe heat exchanger, which has the advantages of accurate positioning of the installation position, high temperature measuring precision and high temperature measuring resolution.
The technical proposal is as follows:
the utility model provides a special temperature measuring stick of on-spot thermophysical property measuring apparatu verifying attachment of ground heat exchanger, includes the body, the body is cylindric, the body side is equipped with a plurality of mounting holes, all be equipped with temperature measuring element on the mounting hole, temperature measuring element increases in proper order from the one end of installation Kong Tanchu, the distance between the mounting hole.
The device comprises a body, wherein a clamping hoop is arranged at one end, which is close to the mounting holes, of the body, the one end, which is provided with the clamping hoop, of the body exceeds the clamping hoop, and a temperature measuring element is arranged at the end, which is provided with the clamping hoop, of the body.
Wherein, the temperature measuring element lead wire on the temperature measuring element is led out from the lead wire hole on the body.
Wherein, the body is filled with pouring sealant. The pouring sealant is preferably epoxy resin, and can prevent moisture and joint filling, improve the strength and toughness of the body and fix the temperature measuring element lead wires.
The verification device comprises a sandbox buried pipe loop, wherein the sandbox buried pipe loop comprises a sandbox, uniform sand is filled in the sandbox, the thermal physical property parameters of the sand are known, a cement column is horizontally arranged in the sandbox and used for simulating drilling, the thermal physical property parameters of the cement column are known, a buried pipe is arranged in the cement column in the vertical direction of the axis of the cement column, a plurality of sections are arranged on the sandbox, a plurality of special temperature measuring rods are uniformly arranged on the sections of the sandbox around the periphery of the cement column, the special temperature measuring rods are connected with a data acquisition device through temperature measuring element leads, and a body of the special temperature measuring rod is fixed on the cement column through a clamp, and a heat insulation pad is arranged between the clamp and the cement column. The heat insulation pad is used for preventing heat exchange between the clamp and the cement column, preventing temperature measurement errors caused by heat loss and enabling temperature measurement to be more accurate.
The cement column is cylindrical, the clamp is semi-annular, and the diameter of the clamp is smaller than that of the cement column.
The device comprises a water tank, a first three-way valve, a second three-way valve, a first temperature sensor, a flow meter, a first circulating water pump, a water tank, a second three-way valve and a second temperature sensor, wherein the outlet of the circulating water pump is connected with the inlet of the water tank, the outlet of the water tank is connected with the inlet of a buried pipe through the second three-way valve, the outlet of the buried pipe is connected with the inlet of the circulating water pump through the first three-way valve, the first temperature sensor and the flow meter are arranged between the outlet of the buried pipe and the first three-way valve, the second temperature sensor is arranged between the second three-way valve and the inlet of the buried pipe, the first temperature sensor, the flow meter and the second temperature sensor are connected with a data acquisition device, a third interface of the first three-way valve and a third interface of the second three-way valve are respectively communicated with the inlet and the outlet of a thermal property measuring instrument to be checked, a heater is arranged in the water tank, and a water supplementing tank is arranged between the circulating water pump and the water tank.
The water tank is characterized in that the top of the sand tank is provided with an opening, a spraying device is arranged above the sand tank, the bottom of the sand tank inclines towards one side of the water tank, a water outlet is formed in the lower portion of the sand tank towards one side of the water tank, a drainage ditch is formed outside the water tank, the spraying device is a drainage pipe, spraying holes are formed in the drainage pipe, and the drainage pipe is connected with a water pipe on the ground surface.
Preferably, the temperature measuring element is a thermistor, the number of the thermistors is nine, the distance between the first four thermistors is the same at one end of the body, which is close to the clamp, the distance between the fifth and sixth thermistors is the same as the distance between the fifth and fourth thermistors, which is 1.5 times the distance between the first four thermistors, the distance between the seventh, eighth and ninth thermistors, which is the same as the distance between the seventh and sixth thermistors, which is 2 times the distance between the first four thermistors. By this arrangement, the distribution of the temperature field in the calibration device can be adapted. The distribution of the temperature field in the verification device is gradually reduced from inside to outside, and the temperature gradient is smaller from inside to outside.
Still preferably, the thermistor is an armored thermistor. The armoured thermistor has the advantages of accuracy, sensitivity, quick thermal response time, stable quality and long service life.
Preferably, the clamp is semi-annular, the diameter of the clamp is smaller than that of the cement column, the two ends of the clamp extend outwards along the radial direction to form a flange, and threaded holes are formed in the flange. By means of the design, when the temperature measuring rod is fixed on the cement column through the clamp, the clamp is deformed when the screw on the threaded hole of the clamp is screwed down because the diameter of the clamp is smaller than that of the cement column, and the temperature measuring rod can be tightly propped against the cement column.
The application method of the special temperature measuring rod checking device for the on-site thermophysical property measuring instrument checking device for the buried pipe heat exchanger comprises the following steps:
(1) Controlling the switch of the first three-way valve and the second three-way valve to enable the water tank to be communicated with the sandbox, and closing a third interface of the first three-way valve and a third interface of the second three-way valve, which are used for respectively communicating an inlet and an outlet of the thermophysical property measuring instrument to be checked;
(2) The circulating water pump is started, water in the sandbox, the water tank and the connecting pipeline is driven to flow, a heater in the water tank is started for heating water in the water tank, and temperature and flow data measured by a special temperature measuring rod, a first temperature sensor, a flowmeter and a second temperature sensor are collected by the data collecting device to serve as reference test data;
(3) Estimating thermophysical parameters of sand and/or cement columns in the sandbox by using the reference test data and the mathematical model acquired in the step (2);
(4) Controlling the switch of the first three-way valve and the second three-way valve, and closing the circulating water pump to enable the thermophysical property measuring instrument to be checked to be communicated with the sandbox, and enable the water tank to be closed with the sandbox;
(5) Starting the thermal property measuring instrument to be verified, enabling water in the thermal property measuring instrument to be verified to circularly flow through a single U-shaped buried pipe in a sandbox, and measuring and recording temperature and flow data as actual test data by using a temperature and flow meter in the thermal property measuring instrument to be verified;
(6) Estimating thermophysical parameters of sand and/or cement columns in the sandboxes according to the actual test data and the mathematical model measured in the step (5);
(7) And (3) comparing the thermophysical parameters calculated in the step (6) with those calculated in the step (3) to verify the temperature and flow meter in the thermophysical measuring instrument to be verified.
The steps (1) - (3) are used for debugging the verification device, and when the verification device operates normally, the subsequent steps can be performed; and (4) performing an operation test on the thermal property measuring instrument to be verified on the verification device, wherein in the operation test, after water flows out of the sandbox, the water enters the thermal property measuring instrument to be verified through the first temperature sensor, the flowmeter and the first three-way valve, then the water flows back into the sandbox through the second three-way valve and the second temperature sensor, whether the thermal property measuring instrument to be verified works normally in the operation test process is checked, and when the thermal property measuring instrument to be verified works normally, the subsequent steps can be performed.
In the step (2), before the circulating water pump is turned on, a spraying device is turned on for correcting the site under the simulated seepage situation.
The invention has the beneficial effects that:
1. The special temperature measuring rod of the field thermophysical property measuring instrument checking device of the buried pipe heat exchanger is a temperature measuring rod which is specially manufactured for the field thermophysical property measuring instrument checking device of the buried pipe heat exchanger, and the temperature measuring rod is convenient to assemble and easy to install in the checking device; the plurality of mounting holes and the temperature measuring element are arranged, so that the temperature measuring precision is high and is less than 0.1 ℃; the temperature measurement resolution is high and is 0.01 ℃; the temperature measuring range of the checking device is between 0 and 100 ℃, the measured data can be remotely transmitted to the upper computer, the clamp is arranged to facilitate the contact between the temperature measuring rod and the cement column, the positioning is accurate, the arrangement of the mounting hole can be more suitable for the distribution of the temperature field in the sandbox, and the measuring precision is high.
2. The verification device is provided with the special temperature measuring rod for the on-site thermal property measuring instrument verification device of the buried pipe heat exchanger, the water tank and the thermal property measuring instrument to be verified are connected in parallel with the sandbox, reference test data and actual test data for verification can be obtained, the thermal property parameters obtained through calculation are calculated according to the reference test data and the actual test data, the thermal property measuring instrument to be verified is verified, and the measurement precision of the thermal property measuring instrument to be verified is guaranteed.
Drawings
FIG. 1 is a schematic structural diagram of a special temperature measuring rod for a field thermophysical property measuring instrument checking device of a buried pipe heat exchanger;
FIG. 2 is a cross-sectional view of A-A of FIG. 1;
FIG. 3 is a system diagram of a verification device provided with a special temperature measuring rod for a field thermophysical property measuring instrument verification device of the buried pipe heat exchanger shown in FIG. 1;
fig. 4 is a schematic cross-sectional view of the sandbox of fig. 3.
Reference numerals: the device comprises a 1-sandbox, 2-sand, a 3-buried pipe, a 4-heat insulation pad, a 5-cement column, a 6-first temperature sensor, a 7-thermophysical property measuring instrument to be verified, an 8-circulating water pump, a 9-water tank, a 10-water supplementing tank, an 11-second three-way valve, a 12-flowmeter, a 13-second temperature sensor, a 14-data acquisition device, a 15-spraying device, a 16-first three-way valve, a 301-body, a 302-mounting hole, a 303-lead hole, a 304-temperature measuring element, a 305-temperature measuring element lead, a 306-clamp, a 307-edge plate, 308-threaded holes and 309-pouring sealant.
Detailed Description
The invention is further illustrated in the following figures and examples.
Examples:
As shown in fig. 1 and 2, the special temperature measuring rod for the on-site thermophysical property measuring instrument checking device of the buried pipe heat exchanger comprises a body 301, wherein the body 301 is cylindrical, a plurality of mounting holes 302 are formed in the side face of the body 301, temperature measuring elements 304 are arranged on the mounting holes 302, the temperature measuring elements 304 extend out of the mounting holes 302, and the distance between the mounting holes 302 is sequentially increased from one end of the body 301.
The dense end of the body 301 between the mounting holes 302 is provided with a clip 306, and the clip 306 is used for fixing the body 301 to the cement column 5. The end of the body 301 provided with the clamp 306 exceeds the clamp 306, and the end of the body 301 provided with the clamp 306 is provided with a temperature measuring element 304.
Preferably, the temperature measuring elements 304 are thermistors, the number of the thermistors is nine, the number of the thermistors is set to be nine, the distance between the first four thermistors is the same, the distance between the fifth and sixth thermistors is the same, the distance between the fifth and fourth thermistors is 1.5 times the distance between the first four thermistors, the distance between the seventh, eighth and ninth thermistors is the same, and the distance between the seventh thermistor and the sixth thermistor is 2 times the distance between the first four thermistors. By this arrangement, the distribution of the temperature field in the calibration device can be adapted. The distribution of the temperature field in the verification device is gradually reduced from inside to outside, and the temperature gradient is smaller from inside to outside. Or the distance between the mounting holes 302 may be arranged according to the distribution of the temperature field.
Still preferably, the thermistor is an armored thermistor. The armoured thermistor has the advantages of accuracy, sensitivity, quick thermal response time, stable quality and long service life.
Specifically, the body 301 is a cylinder, the length of the body 301 is 1200mm, the diameter of the section of the body 301 is 15mm, the wall thickness of the body is 0.5mm, nine mounting holes 302 are formed and are located on the same straight line, the diameter of each mounting hole 302 is 5mm, temperature measuring elements 304 are mounted, and the distances from top to bottom of the nine armored thermistors are respectively 100mm, 150mm, 200mm and 200mm.
There is a nonlinear relationship between the resistance and temperature of the thermistor, and in order to obtain accurate measurement data, the thermistor needs to be corrected by using Fluke 2638A.
Wherein, the temperature measuring element lead 305 on the temperature measuring element 304 is led out from the lead hole 303 on the body 301. Specifically, the temperature measuring element lead 305 is a seven-strand copper core wire with two cores, a wire diameter of 0.16mm and an outer diameter of 3.4mm, the temperature measuring element lead 305 is waterproof treated by teflon materials, the lead hole 303 is arranged at the middle position of the back of the body with the mounting hole 302, and one lead hole is arranged, and all the temperature measuring element leads 305 are led out from the lead hole 302 and are fixed by a hot melt adhesive rod.
Wherein, the body 301 is filled with a pouring sealant 309. The whole body 301 is made of PVC plastic, and the influence on the temperature field in the sandbox 1 is small because the PVC plastic has low heat conductivity coefficient; the pouring sealant 309 is made of epoxy resin, so that moisture-proof caulking can be realized, the strength and toughness of the body 309 are improved, and the temperature measuring element lead 304 is fixed.
Wherein, the end of the body 301 provided with the clamp 306 extends beyond the clamp 306. Specifically, the length of the body 301 beyond the clamp 306 is 5mm, so that the temperature measuring element 304 closest to the clamp 306 can be fully contacted with the cement column 5 after the body 301 is mounted on the cement column 5, and the effect of accurate positioning is achieved.
As shown in fig. 3 and 4, the calibration device provided with the special temperature measuring rod of the on-site thermophysical property measuring instrument calibration device of the buried pipe heat exchanger shown in fig. 1 comprises a sandbox ground buried pipe loop, the sandbox ground buried pipe loop comprises a sandbox 1, uniform sand 2 with known thermophysical property parameters is filled in the sandbox 1, uniform sand filled in the sandbox 1 is used for replacing underground rock soil, a cement column is horizontally arranged in the sandbox 1, the cement column 5 is used for simulating drilling, the thermophysical property parameters of the cement column 5 are known, a buried pipe 3 is arranged in the cement column 5, the buried pipe 3 is a single U-shaped ground buried pipe, a plurality of sections are arranged on the sandbox 1 in the vertical direction of the axis of the cement column 5, a plurality of special temperature measuring rods are uniformly arranged around the periphery of the cement column 5 on the sections of the sandbox 1, the special temperature measuring rod is connected with a data acquisition device 14 through a temperature measuring element lead 305, a body 301 of the special temperature measuring rod is fixed on the cement column 5 through a clamp 306, and a heat insulating pad 4 is arranged between the clamp 306 and the cement column 5. The heat insulation pad 4 is used for preventing heat exchange between the clamp 306 and the cement column 5, preventing temperature measurement errors caused by heat loss, and measuring the temperature more accurately. The special temperature measuring rod detects the temperature field distribution of sand 2 on the surface of the cement column 5 and in the sandbox 1.
The cement column 5 is cylindrical, the clamp 306 is semi-annular, and the diameter of the clamp 306 is smaller than that of the cement column 5.
Specifically, the sandbox 1 is a cuboid with the structure of 2.55x2.55x21 m, the structure is reinforced concrete, the thickness is 250mm, the cement column 5 is arranged in the center of the sandbox 1, and the diameter is 15cm. Seven sections of the sandbox 1 are arranged, four special temperature measuring rods are uniformly arranged on each section around the periphery of the cement column 5, namely, the included angle of the axes of each special temperature measuring rod is 90 degrees. A drawing type access door is reserved on one side of the sandbox 1, so that the later sand filling, outward sand discharge and overhaul of a temperature measuring element are facilitated, the outer wall of the sandbox 1 is required to be subjected to heat preservation treatment in order to avoid the influence of the surrounding environment on the sandbox 1, and the outer wall of the sandbox 1 is made of heat preservation foam boards and cement mortar.
Specifically, two ends of the clip 306 extend outwards along a radial direction to form a plate 307, and threaded holes 308 are formed in the plate 307. By the design, when the body 301 is fixed on the cement column 5 through the clamp 306, the clamp 306 can deform when the screw on the threaded hole 308 of the clamp 306 is screwed down because the diameter of the clamp 306 is smaller than that of the cement column 5, so that the body 306 can tightly prop against the cement column 5.
Specifically, the radius of the outer circumference of the semi-annular clamp 306 is 75mm, the thickness is 0.5mm, the edge plate 307 and the clamp 306 are welded together, or the semi-annular clamp is integrally designed, the diameter of the threaded hole 08 is 15mm, the threaded hole 308 is used for installing the body on the cement column 5, and the clamp 306 and the edge plate 307 are made of metal materials.
The water heater further comprises an external pipeline, the external pipeline comprises a first temperature sensor 6, a flowmeter 12, a first three-way valve 16, a circulating water pump 8, a water tank 9, a second three-way valve 11 and a second temperature sensor 13, wherein the outlet of the circulating water pump 8 is connected with the inlet of the water tank 9, the outlet of the water tank 9 is connected with the inlet of the buried pipe 3 through the second three-way valve 11, the outlet of the buried pipe 3 is connected with the inlet of the circulating water pump 8 through the first three-way valve 16, the first temperature sensor 6 and the flowmeter 12 are arranged between the outlet of the buried pipe 3 and the first three-way valve 16, the second temperature sensor 13 is arranged between the second three-way valve 11 and the inlet of the buried pipe 3, the first temperature sensor 6, the flowmeter 12 and the second temperature sensor 13 are all connected with a data acquisition device 14, a third interface of the first three-way valve 16 and a third interface of the second three-way valve 11 are respectively communicated with a thermal property 7 to be checked and an outlet, and a heater is arranged in the water tank 9 for heating the water. And a water supplementing tank 10 is arranged between the circulating water pump 8 and the water tank 9 and is used for compensating the loss of water at the pipeline connection position and other places when the verification device operates.
Optionally, in order to realize correcting to the thermophysical property measuring apparatu 7 of waiting to check up under the seepage flow sight, sandbox 1 open top is equipped with detachable thermal baffle, sandbox 1 top is equipped with spray set 15, spray set 15 is the drain pipe, beat the spraying hole on the drain pipe, the drain pipe is connected with the water pipe on the earth's surface, sandbox 1 bottom inclines towards water tank 9 one side, sandbox 1 is equipped with the outlet towards the below of water tank 9 one side for carry out the drainage when having the seepage flow experiment, water tank 9 is equipped with the escape canal outward.
Specifically, the drain pipe is arranged at a position 1 m-1.5 m above the sandbox, and the spraying device 12 is used for simulating underground seepage. After the bottom of the sandbox 1 is inclined towards one side of the water tank 9, the included angle between the plane where the bottom of the sandbox 1 is positioned and the horizontal plane is 0.005 degrees.
When in use, the use method of the verification device provided with the special temperature measuring rod for the field thermophysical property measuring instrument verification device of the buried pipe heat exchanger shown in fig. 1 comprises the following steps:
(1) The first three-way valve 16 and the second three-way valve 11 are controlled to be opened and closed, so that the water tank 9 is communicated with the sandbox 1, and a third interface of the first three-way valve 16 and a third interface of the second three-way valve 11 for respectively communicating an inlet and an outlet of the thermophysical property measuring instrument 7 to be calibrated are closed;
(2) The circulating water pump 8 is opened, water in the sandbox 1, the water tank 9 and the connecting pipeline is driven to flow, a heater in the water tank 9 is started for heating the water in the water tank 9, and the data acquisition device 14 is utilized to acquire temperature and flow data measured by a special temperature measuring rod, the first temperature sensor 6, the flowmeter 12 and the second temperature sensor 13 as reference test data;
(3) Estimating thermophysical parameters of sand 2 and/or cement column 5 in sandbox 1 by using the reference test data and mathematical model collected in step (2);
(4) The first three-way valve 16 and the second three-way valve 11 are controlled to be opened and closed, the circulating water pump 8 is closed, the thermophysical property measuring instrument 7 to be checked is communicated with the sandbox 1, and the water tank 9 is closed with the sandbox 1;
(5) Starting the thermal property measuring instrument 7 to be verified, enabling water in the thermal property measuring instrument 7 to be verified to circularly flow through a single U-shaped buried pipe in the sandbox 1, and measuring and recording temperature and flow data as actual test data by using the temperature and flow meters in the thermal property measuring instrument 7 to be verified;
(6) Estimating the thermophysical parameters of the sand 2 and/or the cement column 5 in the sandbox 1 according to the actual test data and the mathematical model measured in the step (5);
(7) And (3) comparing the thermophysical parameters calculated in the step (6) with those calculated in the step (3) to correct the temperature and flow meter in the thermophysical measuring instrument 7 to be calibrated.
The steps (1) - (3) are used for debugging the verification device, and when the verification device operates normally, the subsequent steps can be performed; and step (4) is used for performing an operation test on the thermal property measuring instrument 7 to be checked on the checking device, in the operation test, after water flows out of the sandbox 1, the water enters the thermal property measuring instrument 7 to be checked through the first temperature sensor 6, the flowmeter 12 and the first three-way valve 16, then the water flows back into the sandbox through the second three-way valve 11 and the second temperature sensor 13, whether the thermal property measuring instrument 7 to be checked works normally in the operation test process is checked, and when the thermal property measuring instrument 7 to be checked works normally, the subsequent steps can be performed.
When the on-site correction in the seepage situation is simulated, in the step (2), before the circulating water pump 8 is turned on, the spraying device 15 is turned on.
Claims (7)
1. The verifying device of the on-site thermophysical property measuring instrument of the buried pipe heat exchanger is characterized by comprising a special temperature measuring rod, wherein the special temperature measuring rod comprises a cylindrical body, a plurality of mounting holes are formed in the side face of the body, temperature measuring elements are arranged on the mounting holes, the temperature measuring elements are arranged Kong Tanchu from the mounting, and the distance between the mounting holes is increased from one end of the body in sequence; the clamp is arranged at one end of the body, which is close to the mounting holes, the distance between the mounting holes is dense, the temperature measuring elements are thermistors, the number of the thermistors is nine, the distances between the first four thermistors, which are close to the clamp, on the body are the same, the distances between the fifth and sixth thermistors, and the distances between the fifth and fourth thermistors are the same, and are 1.5 times of the distances between the first four thermistors; the distances between the seventh, eighth and ninth thermistors and the distances between the seventh and sixth thermistors are the same and are 2 times of the distances between the first four thermistors; the nine thermistors can be adapted to the distribution of a temperature field in a checking device of the field thermophysical property measuring instrument of the buried pipe heat exchanger;
the special temperature measuring rod is arranged in a field thermophysical property measuring instrument checking device of the buried pipe heat exchanger, the field thermophysical property measuring instrument checking device of the buried pipe heat exchanger comprises a sandbox buried pipe loop, the sandbox buried pipe loop comprises a sandbox, sand is uniformly filled in the sandbox, a cement column is horizontally arranged in the sandbox and used for simulating drilling, and a buried pipe is arranged in the cement column; the sand box is provided with a plurality of sections in the vertical direction of the axis of the cement column, the sections of the sand box are uniformly provided with a plurality of special temperature measuring rods around the periphery of the cement column, the special temperature measuring rods are connected with a data acquisition device through temperature measuring element leads, the body of the special temperature measuring rod is fixed on the cement column through a clamp, and a heat insulation pad is arranged between the clamp and the cement column; and measuring the temperature field distribution of sand in the sandbox by using a plurality of special temperature measuring rods.
2. The calibrating device for on-site thermophysical property measuring instrument of ground heat exchanger according to claim 1, wherein the end of the body provided with the clamp exceeds the clamp, and the end of the body provided with the clamp is provided with a temperature measuring element.
3. The apparatus of claim 1, wherein the temperature sensing element leads on the temperature sensing element are led out of the lead holes on the body.
4. The device for calibrating a field thermophysical property measuring instrument of a buried pipe heat exchanger according to claim 1, wherein the body is filled with pouring sealant.
5. The device for calibrating a field thermophysical property measuring instrument of a buried pipe heat exchanger according to claim 1, wherein the cement column is cylindrical, the clamp is semi-annular, and the diameter of the clamp is smaller than that of the cement column.
6. The on-site thermophysical property measuring instrument calibration device of claim 5, further comprising an external pipeline, wherein the external pipeline comprises a first temperature sensor, a flowmeter, a first three-way valve, a circulating water pump, a water tank, a second three-way valve and a second temperature sensor, wherein an outlet of the circulating water pump is connected with an inlet of the water tank, an outlet of the water tank is connected with an inlet of a buried pipe through the second three-way valve, an outlet of the buried pipe is connected with an inlet of the circulating water pump through the first three-way valve, the first temperature sensor and the flowmeter are arranged between the outlet of the buried pipe and the first three-way valve, the second temperature sensor is arranged between the second three-way valve and the inlet of the buried pipe, the first temperature sensor, the flowmeter and the second temperature sensor are all connected with the data acquisition device, a third interface of the first three-way valve and a third interface of the second three-way valve are respectively communicated with a thermophysical property measuring instrument to be calibrated, a heater is arranged in the water tank, and a water tank is arranged between the circulating water pump and the water tank.
7. The device for verifying the on-site thermophysical property measuring instrument of the buried pipe heat exchanger according to claim 6, wherein the top of the sandbox is opened, a spraying device is arranged above the sandbox, the bottom of the sandbox is inclined towards one side of the water tank, a water outlet is arranged below one side of the sandbox towards the water tank, a drainage ditch is arranged outside the water tank, the spraying device is a drainage pipe, spraying holes are formed in the drainage pipe, and the drainage pipe is connected with a water pipe on the ground surface.
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| CN109974872B (en) * | 2019-04-04 | 2024-06-21 | 珠海格力电器股份有限公司 | Detection tool for improving temperature detection precision |
| CN110243858B (en) * | 2019-06-10 | 2024-03-22 | 佛山科学技术学院 | Plant liquid flow detection device and detection method thereof |
| CN115791872B (en) * | 2023-01-30 | 2023-06-13 | 天津地热开发有限公司 | Heat transfer analysis method and system for buried pipe heat exchanger |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107525821A (en) * | 2017-09-27 | 2017-12-29 | 山东省地矿工程集团有限公司 | Live thermal property tester caliberating device and method |
| CN208206849U (en) * | 2018-03-12 | 2018-12-07 | 山东亚特尔集团股份有限公司 | Ground heat exchanger scene thermophysical property measurement instrument calibration equipment Special temperature measurement stick |
| CN114916101A (en) * | 2022-05-12 | 2022-08-16 | 西北核技术研究所 | Heating rod and heating rod bundle device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102620835A (en) * | 2012-03-31 | 2012-08-01 | 中冶南方(武汉)威仕工业炉有限公司 | System for calibrating surface temperature of metal flat plate |
| CN204904695U (en) * | 2015-08-13 | 2015-12-23 | 长安大学 | It forms experimental observation device that develops to do top layer |
-
2018
- 2018-03-12 CN CN201810201293.8A patent/CN108318524B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107525821A (en) * | 2017-09-27 | 2017-12-29 | 山东省地矿工程集团有限公司 | Live thermal property tester caliberating device and method |
| CN208206849U (en) * | 2018-03-12 | 2018-12-07 | 山东亚特尔集团股份有限公司 | Ground heat exchanger scene thermophysical property measurement instrument calibration equipment Special temperature measurement stick |
| CN114916101A (en) * | 2022-05-12 | 2022-08-16 | 西北核技术研究所 | Heating rod and heating rod bundle device |
Non-Patent Citations (2)
| Title |
|---|
| "杭州市浅层地温资源温度场特征";秦祥熙等;《太阳能学报》;第第38卷卷(第第3期期);第834页左栏倒数第一段 * |
| 秦祥熙等."杭州市浅层地温资源温度场特征".《太阳能学报》.2017,第第38卷卷(第第3期期),第834页左栏倒数第一段. * |
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